[sdiy] mm5837 are all over the place!

[Ray Wilson]

Hi

I just layed out a board with three of these using the artwork on my site
but I still haven't etched and populated it yet. The circuit works for
certain (I kludged one together on a Radio Shack project board). When I etch
the board I plan to make one a multi-noise source/random gate generator and
the other two just random gate generators. I keep getting ideas and I want
to do all the circuit boards at once. I'm 99.44% certain that the board art
will work fine but I never feel completely comfortable (0.56% discomfort)
until I make one and then I can with certainty say that it will work.

So the short answer is "not yet."

Sorry for the verbosity.

Ray

-----Original Message-----
From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of R. Drake
Sent: Saturday, October 11, 2003 10:51 AM
To: synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] mm5837 are all over the place!


ray,

have you built one of these using the PC board artwork on your site yet?
thanks as always for the incredible resource.

lbd

on 10/11/03 10:31 AM, Ray Wilson at rayw at csd.net wrote:

> I have posted a cool circtuit that gives rail to rail digital noise and
> works with a lowly 2N3904. Check it out.
>
> http://atlas.csd.net/~rjwsoft/multinoisemodule_exp.html
>
> It takes a couple of parts and a  dual op amp and BAM you get all the high
> amplitude non-cyclic noise you want. The upper left corner of the
schematic
> is the noise generation part.
>
> Ray
>
>
> -----Original Message-----
> From: owner-synth-diy at dropmix.xs4all.nl
> [mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of Harry Bissell Jr
> Sent: Friday, October 10, 2003 8:53 AM
> To: WeAreAs1 at aol.com; synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] mm5837 are all over the place!
>
>
> I did a longer shift register in my Prophet V...
> the amplified noise transistors would have had a
> vastly different amplitude (not digital with rail to
> rail swings) and messed up the factory patches.
>
> H^) harry
>
> --- WeAreAs1 at aol.com wrote:
>> I'm guessing that the majority of MM5837's were sold
>> to drum machine makers.
>> That is, organ manufacturers who had beat boxes
>> built into their organs
>> (Thomas, Lowery, etc.).  If you're just using it to
>> make "snare drum" and "hi hat"
>> noise, with short little decay envelopes, then the
>> cyclic pattern repetition
>> would not be much of an annoyance.  On the other
>> hand, in synths?  Shame on
>> Moog, Sequential, and everyone else who wussed out
>> and used those in their synths
>> instead of amplifying selected noise transistors.
>>
>> Michael Bacich